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JP Mangalindan - Mashable's technology reporter. Previously, Mangalindan was a Fortune staff writer for 5 years covering the intersection of business and technology.

Silicon Valley's top tech companies, including Apple, Facebook, Google and Twitter, signed an open letter on Tuesday to President Obama — urging him to reject any government proposals that would grant law enforcement access to their users' encrypted data.

The strongly worded four-page letter was signed by more than 75 companies and cybersecurity experts.

Giving law enforcement access to users' data won't just compromise the products, the letter said, but also leave them more vulnerable to attacks.