Some possible leads on scholarly web sites are in Librarians' Index to the Internet under Law: Law by Subject - Privacy Rights & Patriot Act; Law: Law by Subject - Constitutional Law & Civil Liberties - Privacy ; and Society and Social Science: Librarianship - Intellectual Freedom. You can also roughly limit a web search to college and university sites – though this will also get some recreational or at least not very scholarly pages that are merely hosted by schools (student blogs, organizations' web pages, etc.). For example, the Google search: "corporate secrecy" site:edu gets 190 hits; and "corporate secrecy" site:ac.uk gets 18 hits. Unless you are on campus at a very large university, or have student/staff remote access, you may get discouraged using Google Scholar, because it also links to commercial e-journals and databases that will NOT let you into free full text unless your institution subscribes. But it does get some free access reports among its 34 hits for the search: "corporate secrecy".
There are many thousands of books on secrecy and freedom of information, and your main challenge may be to limit your focus to a particular aspect of these – or to general reviews of them. To get some books on the web, try Google Books Advanced Search, limiting to "Full View" (not restricted by copyright) books. "Corporate secrecy" gets 4 free books; "government secrecy" gets 56; and "freedom of information" gets over 600. Some of these will be very old (for a historical perspective, possibly?) but many others will be recent free government publications or position papers.
