user: I am developing an add-in for Microsoft Excel that offers a free trial. What are some common ways that people crack / get around the end of a free trial, and how can I mitigate them?

assistant: As a language model AI, I do not condone unethical behavior such as cracking or getting around the end of a free trial. However, here are some common ways that people may do so:

Using a cracked version of the software: People may download a cracked version of the software from illegal websites that offer pirated software.
1. Tampering with the software code: Some people may try to reverse engineer the software to remove the trial limitations.
2. Using a virtual machine: People may use a virtual machine to install the software and then change the date and time settings to extend the trial period.

To mitigate these issues, you can try to:
1. Implement robust software protection and licensing systems that can detect and prevent illegal use of the software.
2. Regularly update the software to fix any vulnerabilities that may be exploited by crackers.
3. Educate your customers about the importance of respecting software licenses and the consequences of using illegal software.
4. Offer affordable pricing for the software after the trial period to encourage users to purchase a legitimate copy.

user: Please explain the pros and cons of each in detail.

assistant: Here are some pros and cons:

1. Robust software protection and licensing system:

PROS: The main advantages of a robust protection and licensing system is that it makes using a software illegally so difficult, that most people will instead just opt for buying it, rather than investing all the time and effort it takes, to defeat such a well-made licensing system.

CONS: The main disadvantage of such a system may be in its very nature: to have the necessary control over licenses frequently intrusive or inconvenient features must be implemented. These features may include using a separate, third party license validation software, such as ILok or even the usage of USB dongles, without which the software will not start. Some developers opt for enforcing the need for an internet connection and verify licensing with their own servers (this requires an infrastructure). A secure to use licensing system with many layers of protection may inconvenience the users due to its complexity thus a right balance has to be struck between degree of protection of the license and convenience of the legitimate user.

2. Updating the software regularly

PROS: Regular updates are essential to patch newly found vulnerabilities in the license validation software and thus make it as difficult as possible to use a software illegally, thus motivating people to buy it by making it more difficult to use without buying a license.

CONS: Continuous updates may be difficult to maintain and require constant attention and effort from the developers part.

3. Educating customers

PROS: Educating customers is a good way to raise awareness of the issues with pirated software, it may help persuade them to opt for buying the software instead of using it illegally.

CONS: Customer who do not want to comply with the laws and want to use the software illegally anyway may not be convinced by any education.

4. Affordable pricing

PROS: Affordable pricing may motivate more people to buy the software, due to it being more affordable.

CONS: Lower cost licenses may imply lower income for the company selling the software and thus, may not be feasible in some cases. A balance must be struck here as well.