7. A method under control of one or more computing systems configured with specific executable instructions, the method comprising: gathering metadata about a work; determining that the work is in the public domain; storing at least a portion of the metadata of the work in a repository of works that are in the public domain; extracting additional metadata of an additional work from a network resource; determining, based on at least a portion of the additional metadata, that the additional work is not stored in the repository; generating, based at least in part on the additional metadata, a numerical confidence level indicative of the additional work passing into the public domain or the additional work being protected by copyright in a country; determining, based at least partly on the numerical confidence level, a recommendation of one of: making the additional work available as a public domain document, making the additional work available for download in the country, or performing further research related to a public domain status of the additional work in the country; and causing display of a user-interface element including the numerical confidence level and the recommendation.
7. A method under control of one or more computing systems configured with specific executable instructions, the method comprising: gathering metadata about a work; determining that the work is in the public domain; storing at least a portion of the metadata of the work in a repository of works that are in the public domain; extracting additional metadata of an additional work from a network resource; determining, based on at least a portion of the additional metadata, that the additional work is not stored in the repository; generating, based at least in part on the additional metadata, a numerical confidence level indicative of the additional work passing into the public domain or the additional work being protected by copyright in a country; determining, based at least partly on the numerical confidence level, a recommendation of one of: making the additional work available as a public domain document, making the additional work available for download in the country, or performing further research related to a public domain status of the additional work in the country; and causing display of a user-interface element including the numerical confidence level and the recommendation. 10. The method of claim 7 , wherein the metadata includes at least one of: a title of the work, an author of the work, an owner of the work, a publisher of the work, an illustrator of the work, a translator of the work, a date of birth for a creator of the work, a date of death for the creator of the work, or a publication date of the work.