You may copy and paste a document to create a new instance of it in the same or other folder. Similarly, you may move a document by cutting it from one folder and pasting it into another folder.
To copy a document, perform the following:
When a document is copied, an automatic "Copy of" and "Original Copy" association is established between the original document and the copy.
To move a document, perform the following:
To be able to cut and paste a document, you must have "Full Control" rights on the document and you must also have sufficient rights in the target folder to create a document. This is because you are essentially deleting a document from the original folder and creating a new document in the target foder.
Copying a document requiers that you have at least "Read" rights to the document. You cannot copy documents for which you do not have "Read" privileges.