Which of the following practices may companies restrict regarding trade secrets?

Companies often have specific policies in place to protect trade secrets, which include information not publicly known that provides a competitive advantage. The practice of using personal phones on company premises may be restricted to prevent unauthorized sharing of sensitive information.

Allowing the use of personal devices can increase the risk of leaking confidential trade secrets, either inadvertently or deliberately. By controlling the use of personal phones, companies can mitigate the chances of data breaches, ensuring that confidential communications and intellectual property remain secure.

The other practices—sending official emails, working outside of office hours, and attending external training—typically involve structured environments and oversight where trade secrets can be safeguarded effectively through company protocols. These practices may be less susceptible to unintentional disclosure of trade secrets compared to the potential risks associated with personal devices.