Materials that are in the public domain are not subject to copyright protections, and may be copied, displayed, and distributed at will. Materials may enter the public domain through expiration of the copyright, by the decision of the copyright owner to place the materials in the public domain, or by virtue of the fact that the materials were not subject to copyright protections to begin with (such as is the case with many government document). Naturally, the availability of materials in the public domain does not excuse their use without appropriate attribution.
The question of what materials are in the public domain may be complex, because a single item might be subject to more than one copyright, not all of which might have expired. Consider these scenarios:
A compact disc containing a recording of a modern pianist playing J.S. Bach’s Inventions. The works were written in 1723 and are in the public domain, but the recording of the much more recent performance of the works may still be subject to copyright.
A compact disc containing a transcribed recording of a 78 rpm record, manufactured in 1910, of a pianist playing J.S. Bach’s Inventions. In this case, both the music itself and the 1910 recording of it have passed into the public domain. However, the compact disc might contain edits, alterations, or compilations of music that would, in their own right, be subject to copyright.
Deciphering copyrights isn’t impossible, but it does take a bit of analysis at times, with an eye toward just what rights are owned by what parties.
Materials that are in the public domain are not subject to copyright protections, and may be copied, displayed, and distributed at will. Materials may enter the public domain through expiration of the copyright, by the decision of the copyright owner to place the materials in the public domain, or by virtue of the fact that the materials were not subject to copyright protections to begin with (such as is the case with many government document). Naturally, the availability of materials in the public domain does not excuse their use without appropriate attribution.
The question of what materials are in the public domain may be complex, because a single item might be subject to more than one copyright, not all of which might have expired. Consider these scenarios:
A compact disc containing a recording of a modern pianist playing J.S. Bach’s Inventions. The works were written in 1723 and are in the public domain, but the recording of the much more recent performance of the works may still be subject to copyright.
A compact disc containing a transcribed recording of a 78 rpm record, manufactured in 1910, of a pianist playing J.S. Bach’s Inventions. In this case, both the music itself and the 1910 recording of it have passed into the public domain. However, the compact disc might contain edits, alterations, or compilations of music that would, in their own right, be subject to copyright.
Deciphering copyrights isn’t impossible, but it does take a bit of analysis at times, with an eye toward just what rights are owned by what parties.