Copyright and patent enforcement does not suppress information, they suppress specific actions on information. You are required to publish information before it can be patented or copyrighted, the information must be available for the public to view. You cannot compare copyright to censorship, it is practically the opposite of censorship as it's designed to encourage creators to publish information.

Even when copyrights are abused to attempt censorship, US copyright law specifically defines Fair Use as an exemption to protect valuable speech.