A Web page's PageRank depends on a few factors:
1. The frequency and location of keywords within the Web page: If the keyword only appears once within the body of a page, it will receive a low score for that keyword.
2. How long the Web page has existed: People create new Web pages every day, and not all of them stick around for long. Google places more value on pages with an established history.
3. The number of other Web pages that link to the page in question: Google looks at how many Web pages link to a particular site to determine its relevance.
My advice would be to revert those changes...they won't stop people to steal your content