# KEEP Create a required purpose for necessary cookies
The ePrivacy directive allows certain cookies to be exempted from the requirement of consent, provided that they satisfy one of the following criteria:
✅ The cookie is used “for the sole purpose of carrying out the transmission of a communication over an electronic communications network”.
✅ The cookie is “strictly necessary in order for the provider of an information society service explicitly requested by the subscriber or user to provide the service”.
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Note, this is not an exemption from the obligation of information, and your Privacy/cookies Policy must inform users about the use of such cookies .
Didomi enables you to create a **required** purpose for these necessary cookies that the user cannot refuse.\
Steps for creating a **Required** purpose:
#### **1. Create a custom purpose for necessary cookies.**
To create a purpose, please refer to [our documentation.](https://support.didomi.io/create-a-custom-purpose-new-flow)\
#### **2. Link your purpose to a vendor**
To create a vendor, please refer to [our documentation](https://support.didomi.io/create-a-vendor-new-flow).\
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#### **3. Mark your purpose as "required"**
1. Select your notice.
2. Go to the section called **1.** **Regulations** and the **Regulations** tab . **(2)**
3. Click on **Edit Vendors & Purposes** in the blue box next to each regulation **(3)** :\
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4\. Select the vendor you created earlier in the vendors list.5. Scroll down to the **Purposes** section and look for the custom purpose you created earlier. \
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6\. Check the box "**Define as essential**" to make your purpose **Required**.\
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7\. Your purpose will be **REQUIRED** in the Preferences view (i.e., Purposes layer) of your consent notice, and the user will not be able to reject the vendor linked to this purpose.\
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Don't forget to click on **SAVE & PUBLISH** when you are done!