Crosswire respects Copyright and other Intellectual Property Rights.
As such, it discourages the creation, or conversion of resources into a format that is used by The Sword Project unless permission to do so has been obtained.
If material was published in the United States after 1921, it is under copyright. Permission to convert material to a Sword Project format has to be obtained, prior to doing so. For other countries, the cut off year may be further back in the past that 1921, or it may be more recent than that.