
Common law, also known as case law or judge-made law, is a body of unwritten laws based on legal precedents and past judicial decisions rather than statutes. It is deeply rooted in stare decisis, which means to stand by things decided. Common law originated in England and was spread to Wales, Ireland, and overseas colonies, and many former colonies retain the common law system today. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is practiced in several countries, including the United States, Australia, Canada, and the United Kingdom. While common law provides rights and freedoms, it also lacks certain provisions contained in human rights treaties.
| Characteristics | Values |
|---|---|
| Definition | Common law is a body of unwritten laws based on legal precedents established by the courts. |
| Other Names | Case law, judge-made law, judicial precedent |
| Sources | Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. |
| Geographic Application | Common law is practiced in Australia, Canada, Hong Kong, India, New Zealand, the United Kingdom, and formerly in its colonies, including the United States. |
| Human Rights Protection | Common law courts have the power to protect human rights principles, including the rule of law, except where legislation specifically overrides this power. |
| Trademark Rights | Common law trademark rights are limited to the geographic area in which the mark is used and are developed through actual use of the mark, without the need for federal registration. |
| Common Law Marriage | A common law marriage is a legal framework that allows couples to be considered married without formal registration of their union. |
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What You'll Learn

Common law trademark rights
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. In the context of trademark rights, common law rights are limited to the geographic area in which the mark is used. For example, if a coffee blend is sold under the name "BLASTER" in California only, the trademark rights to that name exist only in California. If another coffee retailer starts selling a different blend in New York under the same name, there would be no trademark infringement. However, if the New York company attempted to sell their coffee blend nationwide, they would find that the California company's common law rights to the mark prevent them from entering the California market.
Federal registration is not required to establish common law rights in a mark or to begin using a mark. However, federal registration is almost always recommended as it gives trademark owners substantial additional rights not available under common law. Common law trademark rights are governed by state law, and each state may have different laws and interpretations regarding trademark protection.
It is important to note that common law trademark rights may vary depending on the specific jurisdiction and the products or services associated with the mark. While common law provides some protection for trademark rights, federal registration offers stronger protection and is generally preferred by trademark owners.
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Common law marriage
Common-law marriage, also known as non-ceremonial marriage, informal marriage, de facto marriage, or marriage by habit and repute, is a marriage that occurs without a statutorily defined process, marriage license, or participation in a marriage ceremony. Instead, it is an agreement between two legally capable individuals who intend to be married, followed by cohabitation and holding themselves out to the world as a married couple. This means that the couple represents themselves to others as being married and organises their relationship as if they were married.
The term "common-law marriage" is often used incorrectly to describe various types of couple relationships, such as cohabitation or other legally formalized relations. These relationships may be legally defined as "unmarried spouses" and treated the same as married spouses for certain purposes, such as taxes and financial claims. However, a common-law marriage is legally recognised as a marriage, whereas cohabitation or other legal partnerships are not.
The original concept of common-law marriage dates back to ancient Greece and Rome, where marriages were private agreements between individuals and estates. In medieval Europe, canon law recognised marriages in which the parties stated they took each other as husband and wife, even in the absence of any witnesses. However, the Catholic Church later forbade clandestine marriages at the Fourth Lateran Council in 1215, requiring all marriages to be announced in a church by a priest.
Today, common-law marriage is recognised in some jurisdictions, such as seven states and the District of Columbia in the United States. While the specific requirements may vary, common elements include cohabitation for a period of time, the legal capacity to marry, mutual intent to be married, and holding themselves out to the community as a married couple. In states that allow common-law marriage, couples may have the same rights as those who went through a formal marriage process.
It is important to note that not all jurisdictions permit common-law marriage, and the recognition of such marriages can vary. While some jurisdictions may respect the validity of a common-law marriage lawfully entered into in another state or country, others may have specific requirements or restrictions in place.
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Common law and human rights
Common law is a system of law that emerges from judicial decisions and the application of legal principles to the facts of a case, rather than from statutes or constitutions. It is a flexible and adaptable system that can reflect changes in social norms and values. Common law can play a significant role in protecting human rights, often in conjunction with statutory or constitutional rights.
In the UK, the Human Rights Act 1998 sets out the fundamental rights and freedoms that everyone in the UK is entitled to. It incorporates the rights set out in the European Convention on Human Rights (ECHR) into domestic British law. This means that individuals can take their cases to British courts, rather than having to seek justice from the European Court of Human Rights in Strasbourg, France. The Act requires all public bodies, such as courts, police, and hospitals, to respect and protect human rights.
While Parliament is responsible for making laws in the UK and is not bound to follow the Human Rights Act, it usually changes laws that are found to be incompatible with the Act. The courts must interpret and apply the law in a way that is as close as possible to the Human Rights Act, even in cases against public authorities or between individuals.
In Australia, a common law country, there is no Constitutional Charter or Bill of Rights. However, common law courts have the power to provide significant protection of human rights principles, including the rule of law, unless overridden by legislation. Common law principles contain concepts intended to protect children and people with disabilities, and freedom from slavery and trafficking fall under fundamental common law freedoms.
The relationship between common law and human rights is complex and multifaceted. While common law can provide a robust framework for protecting human rights, it may also fall short in certain areas, such as lacking provisions for active measures to promote and protect human rights. The normative reach of the system, the rigour with which it equips courts to uphold rights, and the resilience of rights in the face of adverse legislative action are all factors that shape the interplay between common law and human rights.
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Common law and freedom of speech
Common law is a term used to refer to law that is developed by judges through decisions of courts and similar tribunals, instead of being embodied in legislation enacted by a legislature. Common law trademark rights, for example, are developed through use and are not governed by statute.
Freedom of speech is a principle that supports the freedom of an individual or a community to articulate their opinions and ideas without fear of retaliation, censorship, or legal sanction. It is usually seen as a negative right, meaning that the government is legally obliged to take no action against the speaker based on their views. However, this also means that no one is obliged to help any speakers publish their views, and no one is required to listen to, agree with, or acknowledge the speaker or their views. Freedom of speech is considered fundamental in a democracy.
The right to freedom of expression has been recognised as a human right in the Universal Declaration of Human Rights and international human rights law. Many countries have constitutional law that protects free speech. For example, England's Bill of Rights of 1689 legally established the constitutional right of freedom of speech in Parliament, which is still in effect. This so-called parliamentary privilege includes no possible defamation claims, meaning parliamentarians are free to speak up in the House without fear of legal action.
In Australia, common law courts have the power to provide significant protection of human rights principles, including the rule of law, except where legislation specifically overrides this power. However, Australia is unusual among common law countries in not having a Constitutional Charter or Bill of Rights.
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Common law in the US
Common law, also known as case law or judge-made law, is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in the principle of stare decisis, which means "to stand by things decided". This means that judges rely on detailed records of previous similar cases and statutes to determine which precedents apply to a new case.
The U.S. common-law system evolved from a British tradition that spread to North America during the 17th and 18th centuries. The adoption of common law in the newly independent United States was controversial, with some seeing it as a threat to the new republic. However, Federalists believed that common law was the birthright of independence, protecting the natural rights of "life, liberty, and the pursuit of happiness".
Common law is practised in several other countries besides the U.S., including Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom. It is distinct from civil law, which is a comprehensive, codified set of legal statutes created by legislators. Civil law clearly defines the cases that can be brought to court and the procedures for handling claims, whereas common law gives judges more flexibility to interpret past precedents and apply them to new situations.
In the U.S., common law has been limited to certain jurisdictions stated in the Constitution, such as admiralty, and possibly some areas outside the traditional jurisdiction of state law. Congress is generally free to legislatively overrule federal courts' common law, except on Constitutional issues and some procedural issues.
One example of common law in practice is in trademark rights. In the U.S., trademark rights arise from the actual use of a mark, and federal registration is not required to establish these rights. For example, if a product is sold under a brand name, common law trademark rights have been created, especially once consumers view the brand name as an indicator of the product's source. These rights are limited to the geographic area in which the mark is used.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts. It is also known as case law or judge-made law.
Civil law is a comprehensive, codified set of legal statutes created by legislators. It clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offence. Common law, on the other hand, draws from institutionalized opinions and interpretations from judicial authorities and public juries.
Common law trademark rights are an example of common law in practice. Trademark rights in the United States arise from the actual use of a mark. For example, if a product is sold under a brand name, common law trademark rights have been created, especially when consumers view the brand name as an indicator of the product's source.
Common law principles contain concepts intended to provide protection for children and people with disabilities in some areas. In Australia, common law courts have the power to provide significant protection of human rights principles, including the rule of law, except where legislation specifically overrides this power.
A common-law marriage, also known as a non-ceremonial marriage, is a legal framework that may allow couples to be considered married without having formally registered their union as either a civil or religious marriage. While it is not common in the U.S., certain states have statutes or allow for common-law marriage if specific requirements are met.
































